MAX6826-MAX6831 Dual Ultra-Low-Voltage SOT23 P Supervisors with Manual Reset and Watchdog Timer General Description Features The MAX6826MAX6831 are ultra-low-voltage micropro- Monitor Primary V Supplies from +1.8V CC to +5.0V and Secondary V Supplies cessor (P) supervisory circuits designed to monitor two CC2 from +0.9V to +2.5V power supplies and have manual reset and watchdog input functions. These devices assert a system reset User Adjustable RESET IN Down to +0.63V if any of the monitored supplies fall below the prepro- (MAX6826/MAX6827/MAX6828) grammed thresholds, and maintain reset for a minimum 140ms (min) Reset Timeout Delay timeout period after the supplies rise above the threshold. 1.6s Watchdog Timeout Period Microprocessor supervisors significantly improve system Manual Reset Input reliability and accuracy compared to separate ICs or discrete components. These devices monitor primary Three Reset Output Options voltages from +1.8V to +5.0V and secondary voltages Push-Pull RESET from +0.9V to +2.5V. These devices are guaranteed to be Push-Pull RESET in the correct state for V down to +1.0V. Open-Drain RESET CC A variety of preprogrammed reset threshold voltages Guaranteed Reset Valid Down to V = +1.0V CC are available (see the Threshold Suffix Guide). The Immune to Short Negative V Transients CC devices include manual reset and watchdog inputs. No External Components The MAX6829/MAX6830/MAX6831 provide a factory- Small 6-pin SOT23 Packages trimmed threshold to monitor a 2nd voltage down to +0.9V. The MAX6826/MAX6829 have a push-pull Ordering Information RESET, the MAX6827/MAX6830 have a push-pull RESET and the MAX6828/MAX6831 have an open-drain PART TEMP RANGE PIN-PACKAGE RESET. The MAX6826/MAX6827/MAX6828 have an MAX6826 UT-T -40C to +125C 6 SOT23 auxiliary monitor that allows user adjustable input to MAX6827 UT-T -40C to +125C 6 SOT23 monitor voltages down to +0.6V. see Selector Guide for MAX6828 UT-T -40C to +125C 6 SOT23 functions available. MAX6829 UT-T -40C to +125C 6 SOT23 MAX6830 UT-T -40C to +125C 6 SOT23 Applications MAX6831 UT-T -40C to +125C 6 SOT23 Portable/Battery- Intelligent Instruments Insert the desired suffix letter (from Standard versions table) Powered Equipment Critical P Monitoring into the blanks to complete the part number. Embedded Controllers Multivoltage Systems Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing -T with +T when ordering. Pin Configuration Standard Versions Table* TOP VIEW MAX6826/MAX6827/MAX6828 RESET(RESET) 1 6 VCC L MAX6826 MAX6831 S GND 2 5 RESET IN/V CC2 R MR 3 4 WDI Z V SOT23-6 *Samples are typically available for standard versions only. The (RESET) MAX6827/MAX6830 ONLY RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY MAX6826/MAX6827/MAX6828 require a 2.5k minimum order V FOR MAX6829/MAX6830/MAX6831 ONLY CC2 increment for all versions. Contact factory for availability. Typical Operating Circuit, Threshold Suffix Guide, and Selector Guide appear at end of data sheet. Standard Versions Table continued at end of data sheet. 19-1867 Rev 3 7/14MAX6826-MAX6831 Dual Ultra-Low-Voltage SOT23 P Supervisors with Manual Reset and Watchdog Timer Absolute Maximum Ratings V , V to GND...............................................-0.3V to +6.0V Operating Temperature Range ......................... -40C to +125C CC CC2 Open-Drain RESET ..............................................-0.3V to +6.0V Junction Temperature ......................................................+150C Push-Pull RESET, RESET ....................... -0.3V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C CC MR, WDI, RESET IN ................................ -0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC Input Current (V ) ............................................................20mA CC Output Current (RESET, RESET) ......................................20mA Continuous Power Dissipation (T = +70C) A 6-Pin SOT23 (derate 8.7mW/C above +70C) ..........696mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V = +4.5V to +5.5V for MAX68 L/M, V = +2.7V to +3.6V for MAX68 T/S/R, V = +2.1V to +2.75V for MAX68 Z/Y, CC CC CC V = +1.53V to +2.0V for MAX68 W/V T = -40C to +125C, unless otherwise specified. Typical values are at T = +25C.) (Note 1) CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T = 0C to +85C 1.0 5.5 A Operating Voltage Range V V CC T = -40C to +125C 1.2 5.5 A T = -40C to +85C 10 20 V = +5.5V, A CC no load T = -40C to +125C 30 A V Supply Current CC I A CC MR and WDI Unconnected T = -40C to +85C 7 16 A V = +3.6V, CC no load T = -40C to +125C 25 A V Supply Current V +2.5V 2 A CC2 CC2 T = -40C to +85C 4.50 4.63 4.75 A MAX68 L T = -40C to +125C 4.47 4.63 4.78 A T = -40C to +85C 4.25 4.38 4.50 A MAX68 M T = -40C to +125C 4.22 4.38 4.53 A T = -40C to +85C 3.00 3.08 3.15 A MAX68 T T = -40C to +125C 2.97 3.08 3.17 A T = -40C to +85C 2.85 2.93 3.00 A MAX68 S T = -40C to +125C 2.83 2.93 3.02 A V Reset Threshold CC V T = -40C to +85C 2.55 2.63 2.70 V TH A (V Falling) CC MAX68 R T = -40C to +125C 2.53 2.63 2.72 A T = -40C to +85C 2.25 2.32 2.38 A MAX68 Z T = -40C to +125C 2.24 2.32 2.40 A T = -40C to +85C 2.12 2.19 2.25 A MAX68 Y T = -40C to +125C 2.11 2.19 2.26 A T = -40C to +85C 1.62 1.67 1.71 A MAX68 W T = -40C to +125C 1.61 1.67 1.72 A MAX68 V T = -40C to +85C 1.52 1.58 1.62 A Maxim Integrated 2 www.maximintegrated.com